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Thread: White stains on ceramic tile

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    Join Date
    Aug 2013
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    Dallas, TX
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    White stains on ceramic tile

    Hello,

    I've attached a picture showing some white stains that we have on our blue ceramic tile around our spa spillover. We've only owned the house for a couple of months, so we have no idea how long these stains have been there. Our water is very high in CH because the previous owner's pool service used cal-hypo once a week to shock. Since we've owned the pool, we've put nothing in the water except bleach and some muriatic acid. What's odd is that these stains appear where the water doesn't make contact with the tile. Any ideas what these stains could be from, and how to remove them without affecting our nice clear water?

    Thanks!
    Attached Images Attached Images
    23,000 gal. IG gunite pool, DE filter, elevated spa with spillover, Polaris 280 cleaner

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    ComputerGuyInNOLA's Avatar
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    Oct 2012
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    Mandeville, Louisiana
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    602

    Re: White stains on ceramic tile

    It is probably calcium scaling. Pour a little muratic acid on it and see if it fizzles. If so it is calcium scale. You need to post a full set of test results so people can better help you. What test kit do you have?
    Gunite/Plaster pool at 13k gallons. All Jandy with CL340 series cartridge filter, 1.5 HP Jandy Stealth pump. Jandy 1400 SWCG and PDA4 controller. Dual waterfalls. Polaris 280. Pool installed August 2012. Southern Louisiana. And lets not forget my trusty TF100 test kit!

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    Aug 2013
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    Re: White stains on ceramic tile

    I have the TF-100. The last time I checked CH a couple of weeks ago, it was consistently reading 860. Since it was so consistent, I stopped checking it regularly in order to save reagent because nothing has been added to the pool that would have changed the reading.

    My other numbers are as follows:
    CYA 70
    FC 8
    CC 0
    TA 100
    pH 7.9 (need to add acid anyway to lower this)

    Will the muriatic acid remove the stains, or will that just indicate if it's indeed calcium?
    23,000 gal. IG gunite pool, DE filter, elevated spa with spillover, Polaris 280 cleaner

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    JoyfulNoise's Avatar
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    May 2015
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    Re: White stains on ceramic tile

    It's most likely evaporite from mist/splash created by the spillway. Evaporite is as the name sounds, water evaporates and leaves behind all the solid compounds in it. It's mostly a mixture of calcium carbonate and salt. That being said, sometimes a little diluted Muriatic acid in a spray bottle (5:1 water to MA, always wear eye protection!) will work wonders.

    If it becomes thick and adherent (you can't scrap it off with a finger nail) then you might consider a pool tile cleaning service and one that specializes in soda blasting (kieserite, aka magnesium sulfate, blasting). I had bad calcium scale all over my pool once and I needed a professional clean. The nice part about kieserite is that it is hard enough to blast away the calcium scale but soft enough not to damage the glaze on ceramic tiles. Unlike using a pumice stone, kieserite will not damage grout or tile glaze.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: White stains on ceramic tile

    Will the muriatic acid remove the stains, or will that just indicate if it's indeed calcium?
    It'll usually remove it completely. Use with caution. The process will start over so you'll have to do it from time to time but yours does not look too bad and will likely clean up nicely.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  6. Back To Top    #6

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    Re: White stains on ceramic tile

    Ok, thanks for the suggestions!
    23,000 gal. IG gunite pool, DE filter, elevated spa with spillover, Polaris 280 cleaner

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